Proceedings of 
the United States 
National Museum 
SMITHSONIAN INSTITUTION + WASHINGTON, D.C. 
Volume 113 1961 Number 3451 
REVISION OF THE MILLIPED GENUS DELTOTARIA 
(POLYDESMIDA: XYSTODESMIDAE) ! 
By Ricwarp L. HorrmMan 
Introduction 
Deltotaria is a distinctive genus of the family Xystodesmidae, 
characterized particularly by the appreciably elongated coxal apophy- 
sis of the male gonopod. Although its component species occupy 
a fairly extensive generic range in the Southern Appalachians and 
may be locally abundant, Deltotaria was not proposed until 1942, 
with only three species subsequently added to the present. Pre- 
sumably the various forms of Deltotaria are even more prone to local 
endemism than species of related genera, and if this is so many years 
may elapse before all have been discovered and classified. 
Existing descriptions are in general adequate for recognition of the 
species, but are scattered over a period of years in different journals, 
and variations particularly in the execution of the illustrations give 
an impression of greater differences between some of the species than 
actually exist in nature. Having had the opportunity to study the 
types of three of the species, as well as to obtain fresh material of 
several in the field, I believe that a brief summary of Deltotaria, 
1 This study was undertaken with the aid of a grant from the National Science Foundation. 
15 
